Shinzo Abe, Japan's prime minister and president of the Liberal Democratic Party (LDP), third from left, places a red paper rose on a LDP candidate's name to indicate an lower house election victory with party executives at the party's headquarters in Tokyo, Japan.

Tokyo: Japanese Prime Minister Shinzo Abe’s ruling bloc was headed for a big win in Sunday’s election, bolstering his chance of becoming the nation’s longest serving premier and reenergising his push to revise the pacifist constitution.

Abe’s Liberal Democratic Party-led (LDP) coalition was set to win 311 seats, keeping its two-thirds “super majority” in the 465-member lower house, an exit poll by TBS television showed.

Public broadcaster NHK also said the ruling bloc was closing in on a two-thirds majority, although some other broadcasters had the ruling bloc slightly below the two-thirds mark.

A hefty win raises the likelihood that Abe, who took office in December 2012, will have a third three-year term as LDP leader next September and go on to become Japan’s longest-serving premier. It also means his ‘Abenomics’ growth strategy centred on the hyper-easy monetary policy will likely continue.

Final official results from the election, which coincided with an approaching typhoon, are expected early on Monday.

The US-drafted constitution’s Article 9, if taken literally, bans the maintenance of armed forces. But Japanese governments have interpreted it to allow a military exclusively for self-defence.

Backers of Abe’s proposal to clarify the military’s ambiguous status say it would codify the status quo. Critics fear it would allow an expanded role overseas for the military.

Abe said he would not stick to a target he had floated of making the changes by 2020. “First, I want to deepen debate and have as many people as possible agree,” he told a TV broadcaster. “We should put priority on that.” The LDP’s junior partner, the Komeito, is cautious about changing the constitution, drawn up after Japan’s loss in the Second World War. Several opposition parties favour changes, but don’t necessarily agree on details.

Referendums risky

Amendments must be approved by two-thirds of each chamber of parliament and then by a majority in a public referendum.

“Now that pro-constitutional change parties occupy more than two-thirds of the parliament, the constitution will be the most important political issue next year,” said Hidenori Suezawa, a financial market and fiscal analyst at SMBC Nikko Securities.

“And as we saw in the UK …, a referendum could be tricky. So while Abe is likely to be prime minister for the time being, it is too early to say whether he can stay in power until 2021.” Abe declined to say if he’d run for a third term.

Abe had said he needed a new mandate to tackle a “national crisis” from North Korea’s missile and nuclear threats and a fast-ageing population, and to approve his idea of diverting revenue from a planned sales tax hike to education and child care from public debt repayment.

He called the poll amid confusion in the opposition camp and an uptick in his ratings, dented earlier in the year by scandals over suspected cronyism and a perception he had grown arrogant after nearly five years in office.

Abe has backed US President Donald Trump’s tough stance towards North Korea, which has test-fired missiles over Japan, that all options, including military action, are on the table.

Trump is to visit Japan on November 5-7 to reaffirm the leaders’ tight ties.

Abe’s gamble pays off

Abe’s snap poll gamble had seemed risky — some early forecasts saw the LDP losing a significant chunk of seats — after Tokyo Governor Yuriko Koike, often floated as a possible first Japanese female premier, launched her conservative Party of Hope.

That party absorbed a big chunk of the failed main opposition Democratic Party, which abruptly decided to run no candidates of its own. But voter enthusiasm soon waned despite its calls for popular policies such as an exit from nuclear power and a freeze on the planned sales tax rise.

Koike did not run for a lower house seat herself — she was in Paris for a climate change event on Sunday — and failed to say whom her party would back for prime minister.

“We had sought to put policies first. But we ended up with a very tough outcome, so I deeply apologise for that,” Koike told NHK.

A new Constitutional Democratic Party of Japan (CDPJ), formed by liberal former DP members, was vying with Koike’s party for the top opposition spot, although both will have just a fraction of the LDP’s presence if forecasts prove accurate.

“Day by day, we felt we were getting more voter support for our call to revive more decent politics, and not fret about whether it’s right or left wing,” said CDPJ lawmaker Tetsuro Fukuyama.

Several experts noted the ruling bloc’s win was less a victory for the conservative, long-ruling LDP than a defeat for a divided opposition.

“Simply put, this was the self-destruction of the opposition,” Zentaro Kamei, a senior research fellow at think tank PHP Institute and former LDP lawmaker, said.

Shinjiro Koizumi, the LDP lawmaker son of popular former premier Junichiro Koizumi, warned against LDP complacency.

“It’s not just that our party has become arrogant and complacent. People are also getting increasingly fed up with us,” he told NHK.

Abe, 63, has already led the LDP and its partner, the Komeito, to four landslide wins since he took the helm of the party. But turnout has been low and the LDP has typically won with about 25 per cent of eligible votes. Others either stayed home or backed opposition parties.

Kyodo News agency estimated turnout on Sunday — when heavy rain from powerful Typhoon Lan lashed much of Japan — at 53.7 per cent, one point above the record low in the last lower house election in 2014.

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